Thanks iurisilvio!
We're definitely seeing a common theme here, it looks like we're really not telling or showing you guys enough up front to explain what the service is / does / is valuable. We're definitely going to have to work on that.
Basically when you sign up we pull in your links from Facebook (and if you connect them; Twitter / Tumblr) to your FetchMe profile. From there you can organize them into collections. The idea is that we're taking your existing activity on the social web, and making it more useful by helping you curate it / find it later. I encourage you to give it a shot, as I'd love to hear what you think about the service itself.
We'd actually just discussed yesterday whether the sign in button / call to action was clear enough, so your point on that helps a lot.
Thanks for the feedback.